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Many financial and government websites have compound interest calculators, such as Bankrate.com and Investor.gov. In addition, some mathematics-oriented websites also have compound interest calculators to illustrate particular uses of calculus in business, explains The Calculator Site.

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One formula for calculating yearly compound interest is M=P(1+i)n. "M" represents the final amount with the principal and interest combined, "P" represents the principal amount, "i" represents the interest rate, and "n" is the number of years invested.

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Financial calculators make excellent tools for planning, forecasting and preparing a wide variety of financial decisions. They simplify several calculations, such as compound interest and regular payments, and can provide graphs that plot assets over time depending on a number of variables that the

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Compound interest is a financial term used to describe the process where the interest earned on a principal investment over a set period of time is added to the principal amount. The interest payable for the following periods is recalculated on the sum of the original investment and the previous int

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The difference between simple interest and compound interest is that simple interest builds only on the principal amount, while compound interest builds on both the principal and previously earned interest. Because of this, compound interest always yields greater profits.

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To calculate interest, multiply the periodic interest rate by the principle amount. For example, if you borrowed $1000 with an interest rate of 10 percent, in a year your interest paid is $100.

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A simple interest calculator figures out the amount of interest that is earned and added to an initial investment amount. To calculate the interest amount, a person must provide the interest amount, interest rate and period of investment. The calculator does the math and displays the total amount of

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To find a free simple interest calculator online, visit math, business software publisher or financial sites, such as WebMath, Money Chimp and Pine Grove Software. The online calculators found on these sites may have different features, such as also calculating future values and daily interest rates

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A tax interest calculator determines the amount of interest owed on taxes that are paid late, as seen on the New York State Department of Taxation and Finance website. Several state tax websites, including New York and Pennsylvania, provide tax interest calculators, as do third-party services.

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Real interest rate is calculated by adjusting for the effects of inflation when compared to the nominal interest rate. The calculation formula is simple, as it only requires subtracting the rate of inflation from the nominal interest rate. The value left after subtraction is the real interest rate.